Restore Flawless Shifting to Your Buick Allure
If your 2006-2009 Buick Allure is suffering from harsh shifting, delayed gear engagement, or has a transmission warning light illuminated, the Transmission Control Module (TCM) is a highly probable cause. As a technician with over two decades of experience, I’ve seen countless GM vehicles, including the Allure, come into the bay with these exact symptoms. The T42 TCM is the electronic brain of your automatic transmission, responsible for every gear change and torque converter operation. When it fails, it can make your car feel unpredictable and unsafe to drive. This isn’t just an inconvenience; it can lead to further transmission damage if not addressed.
This replacement T42 Transmission Control Module, part number 24240400, is the definitive solution. We take the guesswork and high dealership costs out of the equation. Each module is expertly programmed to your vehicle’s specific VIN before it ships. This means it arrives at your door ready for a true plug-and-play installation, with all the latest software updates from General Motors. You get a part that communicates perfectly with your vehicle’s systems right out of the box, restoring the smooth, reliable performance you expect from your Buick.
A Technician’s Notebook: The Elusive Allure Shifting Problem
A customer brought in their ’08 Allure with a complaint that felt familiar: intermittent, bone-jarring shifts from 1st to 2nd gear, but only after the car was fully warmed up. No check engine light, just a very unhappy driver. My initial scan showed no hard codes, a common scenario that frustrates many mechanics. However, by monitoring live data, I saw the line pressure command from the TCM was erratic. Instead of a complex internal transmission repair, the fix was a new TCM. We installed one of our pre-programmed modules, and in less than an hour of total time (including the test drive), the car was shifting like it just left the factory. This case highlights why a quality, correctly programmed 2006-2009 Allure TCM is often the fastest and most reliable fix.
Is Your Buick Allure Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Catching these symptoms early can save you from a much more expensive repair down the road. Look out for:
- ✔ Harsh, slamming, or erratic gear shifts.
- ✔ The vehicle getting stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0700, P0750, or other solenoid-related faults.
- ✔ A noticeable delay when shifting from Park into Drive or Reverse.
- ✔ Poor fuel economy and a feeling of sluggish performance.
Your Step-by-Step Buick Allure TCM Installation Guide
For the 2006-2009 Buick Allure, this is a job most DIY enthusiasts can handle in their own driveway. The TCM is typically located under the lower air cleaner housing, making it accessible with basic tools.
- Safety First: Before you begin, disconnect the negative terminal from your car’s battery to prevent any electrical shorts and to help reset the vehicle’s electronic systems.
- Access the Module: Remove the air cleaner assembly to gain clear access to the TCM. It will be mounted with a few bolts or screws.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Note the locking tabs to avoid damaging them. Once disconnected, unbolt the module and remove it from the vehicle.
- Install the New TCM: Mount your new, VIN-programmed TCM in the same location and secure it with the original bolts. Reconnect the electrical harnesses, ensuring they click securely into place.
- Final Steps: Reinstall the air cleaner assembly. Reconnect the negative battery terminal. Start the vehicle and take it for a test drive to confirm that shifting performance has been restored. While our programming resolves most issues, it’s good practice to clear any old codes with a scan tool if you have one.
Verified Vehicle Compatibility for Part 24240400
While this listing is tailored for the 2006-2009 Allure TCM, this module is a direct replacement for a wide range of General Motors vehicles. It is interchangeable with part numbers like 24252114, 24234503, 24230461, 24240400, and more. It fits models including:
- ✔ Buick Allure (2006-2009) – located in the lower air cleaner housing
- ✔ Chevrolet Impala & Monte Carlo (2006-2011)
- ✔ Pontiac Grand Prix (2006-2008)
- ✔ Chevrolet Silverado & GMC Sierra (various years)
- ✔ Chevrolet Tahoe & GMC Yukon (various years)
- ✔ And many other GM cars, trucks, and SUVs equipped with a 4-speed automatic transmission.
Frequently Asked Questions
Frequently Asked Questions
What does “VIN Programmed” actually mean for me?
It means we load your car’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it works perfectly with your specific engine, transmission, and options, eliminating the need for an expensive programming session at a dealership.
Do I need any special tools for installation on my Allure?
No special tools are required. Basic hand tools like a socket set and screwdrivers to remove the air cleaner housing are all you should need. The entire process typically takes less than an hour.
Will this fix a P0700 transmission fault code?
A P0700 code is a general fault request from the TCM to the main computer. Often, a faulty TCM is the root cause. Replacing it with this module will very likely resolve the P0700 and any related specific codes (like for shift solenoids) if the module itself is the problem.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or recycle it locally without the hassle of shipping it back to us.
What kind of warranty comes with this part?
This transmission control module is backed by our solid one-year warranty, giving you peace of mind in your repair.